Emergency services were called to the A11 at Besthorpe earlier this afternoon after two cars and a tractor were involved in a collision.
It happened just before the B1077 Ellingham Road junction at about 12.25pm.
A spokesperson for Norfolk Police said a Volvo V70 and a Vauxhall Zafira, as well as a tractor, were involved.
Emergency services arrived at the scene to find one of the cars in a ditch and on its side.
An ambulance officer and two crews attended, with one female being taken to the Norfolk and Norwich University Hospital for further treatment.
A spokesperson for the East of England Ambulance Service said the patient was in a “stable, and non-life threatening” condition.
The road was blocked southbound but had been cleared by 2.20pm.